Fuel Guage Sending Unit Clogged

I have a 1979 Dodge Powerwagon W200
with a 360 engine. Ive been workimg on it
for a while and finally got it running and i
took for a couple drives. On the secomd
drive the truck stalled like it was out of
gas...after blowing out all the fuel lines we
realized that gas wasent getting to the
carburetor. We took the underbed gas tank
off and checked the Fuel Guage Sending
Unit and one the tubes is clogged. We
blew it out with a air compresser, pressure
washer, and even tried to use a wire to
push whatever was in there out. I was
wondering how i could get it unclogged or
where i could maybe bye a new one?